Ecotone gas price

[matYang]

After the Ecotone upgrade, OP stack l1 gas price is no longer simply a query of l1BaseFee: https://docs.optimism.io/stack/transactions/fees#ecotone

The new equations are:

l1_data_fee = tx_compressed_size * weighted_gas_price

weighted_gas_price ~= (16 * base_fee_scalar * base_fee + blob_base_fee_scalar * blob_base_fee) / 10^scalar_decimal / 16

We implement a simpler way to calculate weighted_gas_price:

weighted_gas_price ~= getL1Fee(0x1) / getL1GasUsed(0x1)

Experiments show this simpler approach gives a gas price within 1% of the value calculated from the formula.
Referencing GasOracle code: https://vscode.blockscan.com/optimism/0xb528d11cc114e026f138fe568744c6d45ce6da7a, this approach uses the same formula under the hood.

This PR implements an OP Stack data availability price reader (DAPriceReader) to abstract the logic out of l1GasOracle.

[github-actions]

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[cl-sonarqube-production]

Quality Gate passed

Issues
2 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
87.1% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube